Forecast

Issued 12th of January 2021

Situation and medium-term forecast

The Spaeth’s alder is still flowering!

Due to the current frosty weather conditions, no widespread distribution of airborne allergens occurs. Only very few pollen grains were recorded in our sampling sites.

The Spaeth’s alder continues flowering but has already passed its peak pollination period between Christmas and new year. Since this tree is a non-native species in Austria, it is only found cultivated in parks or as ornamental trees. Pollen allergy sufferers may experience allergenic burden in close vicinity to such trees.

Note: The immune system of a pollen allergy sufferer may be more susceptible at the start of the pollen season. Birch pollen allergy sufferers may be potentially concerned by the Spaeth’s alder’s pollination due to cross-reaction.

The first low burden from hazel pollen in foehn areas is expected at the start of February.

The forecasted start date of the hazel and alder pollen season is calculated based on forecast models. Due to the uncertainty of long-term temperature forecasts, hazel and alder’s actual flowering start can still vary. The predictions become more accurate as the season approaches.

Your Austrian pollen information service team

We expect the readiness to flower for alder and hazel in	on
Vienna	31.01.2021
Eisenstadt	05.02.2021
St. Pölten	05.02.2021
Linz	08.02.2021
Salzburg	03.02.2021
Innsbruck	12.02.2021
Bregenz	07.02.2021
Graz	12.02.2021
Klagenfurt	25.02.2021
Bolzano	01.02.2021
Munich	10.02.2021

Forecast from 12.01.2021
Note: The model results give an indication of the expected start of flowering, based on information provided by local pollen warning services with direct reference to the local situation. Start of flowering is not to be equated with the beginning of the pollen season. When the start of flowering is achieved, the majority of the plants have the potential to release pollen, but only when weather conditions are favourable.